The new 7CrMoVTiB10-10 material for boiler membrane walls

摘要

Besides the main components such as headers, piping, superheaters and separators, the membrane wall as flue gas-tight enclosure of the combustion chamber is of central importance for the design of a steam generator. The safety margins are more and more exhausted for the 15Mo3 and 13 CrMo4-4 materials, used so far for membrane walls, by increasing operating pressures and temperatures to raise the efficiency of a power plant. Alternatives to the two above-mentioned materials would be desirable in addition to design modifications. A comparison with Japanese developments is made, where also new materials for membrane walls are being tested.